Who can explain me the marked part?

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zhangpujumbo

in the attachment.

Why the grand total angular momentum is 0?

thank u!

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zhangpujumbo said:

in the attachment.

Why the grand total angular momentum is 0?

thank u!

The notation is explained a few lines above! It's [itex]\,^{2s+1}L_j[/itex] so the subscript "0" tells you that the state has j=0!